High-speed grinding-mill.



J. S. FASTING. HIGH SPEED GRINDING MILL- APPLICATION FILED JUNE 5. 1914.

Patented May 30, 1916.

2 SHEETSSHE ET I.

V I "I.

WITNESSES J. S. FASTING. HIGH SPEED GRINDING MILL. APPLICATION FILED JUNE 5.1914.

Patented May 30, 1916 2 SHEETS-SHEET 2- WITNESS To all whom it may concern lid S. TASTING, 01E FREDERIKSBERG, NEAR COPENHAGEN, DENMARK, ASSIGNOJR T0 F. L. Shim & 00., Oh NEW YORK, N. Y., A CQRPORATION OF NEW JERSEY.

HIGH SIEED GRINDING-MILL.

Be it known that LJoHaN S. Fnsrrno, a subject of the King of Denmark-,residmg in Frederiksberg, near Copenhagen, Denmark, have invented certain new and useful Improvements in High-Speed Gr nding- Mills, of which the following is a speciiication, reference being had to the accompanying drawing, which forms a part hereof.

in a co-pending application filed by the present applicant on the 5th day of June 1914, Serial No. 843,143, is shown and described an improved high speed grinding mill in which rolling members are employe to crush the material and impel the same through the mill from the feed end to the discharge end.

The present invention relates generally to mills of the type shown said co-pending case and is concerned part cularly with the rolling members and devices whereby said rolling members may be adjusted with respect to the wali of the mill. When .the grindin operation is started it W11]. be understoo that the .load thrust on the prime mover is relatively great where the grinding body rests loosely within the mill. Moreover, sudden starts and stops of the movement of the rolling member with respect to the mill is aptto Wear the rolling member unevenly so as to lower the efiiciency of operation of the com lete plant. Moreover, where movement is imparted to the grmding body immediately upon the rotation of the mill, it is impossible for the coarser particles of the material to move into position between the roller and the mill and hence the crushin is not highly efiective until after the has been operated for some little time.

The object of this invention is to meet the dificulties pointed out above and to provide means wherdby the grinding roller or rollers may be moved out of contact wlth the inner surface of the mill and held such inoperative position, until the mill 1s brought up to a relatively high speed and suficient material has been fed into the space between the roller and the mill to engage the surface of the roller and br ng about its rotation and subsequent crushing action. In accordance with the invention the shaft of the roller is provided withtwo bearings, the inner one of which is ad ust- Fig. 2 is 'a y speeineation of Letters Patent. pm m M 3% 19pm Application tiled June 5, 1914. Serial No. 8%,1dt.

able vertically to permit the roller to be raised out of engagement with the surface of the mill .or lowered into enga ement therewith. This bearing is prefera ly of such a character as to permit free vertical movement of the shaft therein and by this arrangement it. becomes possible to place welghts on the bearing and thus increase the efiectiveness of the crushing roller.

Another feature of the invention incidental to the construction briefly outlined,

resides in the capacity of the shaft of the roller to be given a movement of rotation Independently of the movement of rotation which the grinding mill imparts to the roller. In this way, the rollermay be rotated positively at a speed different from the speed of rotation'of the mill and the efiectiveness of the crushing action thereby enhanced.

The invention will be described more particularly with reference to the accompany ing drawings, in which-- Figure 1 is a view partly in horizontal section and partly in plan of a complete plant embodyingthe present improvements. view, partly in elevation and partly in section of the apparatus shown in Fig. 1 and illustrating particularly the mechanical device for eifecting the desired adjustment of the rotating shaft.

The grinding mill a is mounted rotatively on an actuating shaft 6 supported in bearings a and 03 end a driving pulley d which may be rotated from any available source of power. One end ofthe mill 0; is provided with an opening, indicated generally at a and through which the material to be crushed may be introduced into the mill through any suitable structure, not illustrated. The material after being crushed is discharged at the opposite end of the mill through peripheral openings a all in the usual manner. Within the mill is mounted a crushing roller 6 fixed on a shaft. f which extends without the mill through the opening a and is mounted at its free end in suitable bearings g of a character to permit free lateral movement of the shaft 7". Adjacent to the end wall of the mill at in which is formed the opening a is mounted a second bearing k for the shaft f in which rest the journals z" for the shaft 7. These journals i are movable vertically in the bearings It so and having fixed on its outer as to permit the shaft 7 and roller e to be moved out of engagement with the surface of the mill to any desired degree.

The invention is not concerned particularly with the devices for bringing about the movement of the journals c', although such devices may conveniently consist of threaded lugs a" formed with the journals 6 and engaged by vertically disposed screws h journaled fixedly in the frame it and carrying at the lower ends bevel pinions 71/ adapted to be engaged by corresponding pinions fixed on a rotatable shaft-h on one end of which is carried a hand wheel h Through the rotation of the hand wheel h the screws [2, are rotated and the journals 2' raised or lowered as may be required for the positioning of the shaft 7. The shaft 7 rests loosely on the journal 71 and is free to raise therefrom, slightly, although being guided in such movement by a yoke f. i

It will now be evident that when the rotation of the mill is to be started, the roller e may be moved out of engagement with the surface of the mill and the material introduced into the mill will eventually fill the space between the roller and the wall of the mill, provided of course that the roller has been moved approximately to its normal clearance position, at which time the friction between the material and the roller will bring about the rotation of the latter and result in the material being crushed and impelled through the mill in the manner pointed out in the co-pending case referred to. The rack and pinion engagement may be such as to permit, during the normal operation of the mill, free ver tical movement of the journals '5 in the bearing h so that the roller e will rest loosely onthe material to be crushed.

Another feature of the present invention, incidental to the vertical movement of the journals '5 resides in the adaptability of said journals to be weighted as conditions require to assist in thecrushing action of the roller e. In this way, it becomes unnecessary to make the roller e of greater dimensions to secure a more effective crushing action since the additional weight'may be transmitted to the crushing-surface through the loaded journals z.

fitill another feature is found in the pro- V1S10I1 of a pulley 7c fixed on the roller shaft Qoutside of the bearing h, which pulley may e driven from any available source of power and rotate the roller 6 at any desired speed, independently ofthe speed of rotation of the mill a. It will be understood that rotation of these two members at different speeds will increase the friction between the roller and the material and thus make the crushmg action more effective.

Certain of the partsof the improved apparatus have been illustrated more or less conventionally in the accompanying draw- 1ng inasmuch as. the invention is not to be limited to the structural details of any of such elements and the equivalents of these elements may be readily substituted by those skilled in the art.

Itis believed that from the description glven the gist of the invention will appear, which is the adjustability of the roller with respect to the inner wall of the mill.

I claim as my invention In combination with'a high speed grinding mill, a rotatable grinding body disposed loosely therein on the bottom of the mill, a shaft to which the grinding body is secured extending without the mill and maintained in. an angular position with respect to the axis of the mill whereby the axis of the grinding body is angularly disposed to the axis of the mill and the material is impelled through the mill during the grinding, end bearings for said shaft to prevent axial movement thereof, and a separate bearing intermediate the ends of the shaft and adjustable in a vertical plane whereby the initial position of the grinding body with respect to its tangential seat on the surface of the mill may be varied.

This specification signed and witnessed this 20th day of May A. D. 1914.

JOHAN S. FASTING.

Signed in the presence of AXEL PERNIM, I. KHUDSEN. 

